Laser light scattering technique for non-invasive<Emphasis Type="Italic">in situ</Emphasis> simultaneous measurements on elastic constants and viscosity coefficients of nematic liquid crystals
(1) Institute of Biomedical Engineering, Jian University, 510632 Guangzhou, China
Abstract:
The laser light scattering technique for non-invasivein situ simultaneous measurements on elastic constants and viscosity coefficients of nematic liquid crystals is introduced. By measuring
the autocorrelation function of the scattered light from nematic liquid crystals at different scattering angles, the splay
and twist elastic constantsK11 andK22 are obtained from the amplitudes of the autocorrelation function, and the viscosity coefficients ofηSplay andηTwist are determined using the viscoelastic ratiosK11/ηSplay andK22ηTwist from the telaxation parameters of the two modes.